**EXHIBIT 31.2**

CERTIFICATION 

| I, Michael Hull,   Chief Financial Officer, certify that: |
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| 1.                                                        | I have reviewed   this annual report on Form 10-K of  BabyUniverse, Inc.; |
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| 2.                                                        | Based on my   knowledge, this report does not contain any untrue statement of a material   fact or omit to state a material fact necessary to make the statements made,   in light of the circumstances under which such statements were made, not   misleading with respect to the period covered by this report; |
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| 3.                                                        | Based on my   knowledge, the financial statements, and other financial information included   in this report, fairly present in all material respects the financial   condition, results of operations and cash flows of the registrant as of, and   for, the periods presented in this report; |
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| 4.                                                        | The registrant’s   other certifying officer and I are responsible for establishing and   maintaining disclosure controls and procedures (as defined in Exchange Act   Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting   (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant   and have: |
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|                                                      | a. | Designed such   disclosure controls and procedures, or caused such disclosure controls and procedures   to be designed under our supervision, to ensure that material information   relating to the registrant, including its consolidated subsidiaries, is made   known to us by others within those entities, particularly during the period   in which this report is being prepared; |
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|                                                      | b. | intentionally   omitted; |
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|                                                      | c. | Evaluated the   effectiveness of the registrant’s disclosure controls and procedures and   presented in this report our conclusions about the effectiveness of the   disclosure controls and procedures, as of the end of the period covered by   this report based on such evaluation; and |
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|                                                      | d. | Disclosed in this   report any change in the registrant’s internal control over financial   reporting that occurred during the registrant’s most recent fiscal quarter   (the registrant’s fourth fiscal quarter in the case of an annual report) that   has materially affected, or is reasonably likely to materially affect, the   registrant’s internal control over financial reporting; and |
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| 5.                                                        | The registrant’s   other certifying officer and I have disclosed, based on our most recent   evaluation of internal control over financial reporting, to the registrant’s   auditors and the audit committee of the registrant’s board of directors (or   persons performing the equivalent functions): |
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|                                                      | a. | All significant   deficiencies and material weaknesses in the design or operation of internal   control over financial reporting which are reasonably likely to adversely   affect the registrant’s ability to record, process, summarize and report   financial information; and |
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|                                                      | b. | any fraud, whether   or not material, that involves management or other employees who have a   significant role in the registrant’s internal control over financial   reporting. |

| Date: April 2, 2007 | By:    | /s/   MICHAEL   HULL |
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|                | Name:  | **Michael Hull**                    |
|                | Title: | **Chief Financial Officer**         |